Centrifugal pump



Weave 35 9 E9239 W, c. DQWD CENTRIFUGAL PUMP Filed Sept. 13 1 922 2 Sheets-Sheet 1 A TTOR/I/EYS Nov. 13 1923.

W. C. DOWD CENTRIFUGAL PUMP Filed Spt. 13. 1922 2 Shee'k-Sheef 2 MTURIIIEVS that the pump is pumping more water in ring 11 has recesses 12 which register .with'75 to have a pump which will operate on subthe drawings. At 13 are outlets for the Other objects and advtantages will appear between the vanes 6, is directed toward the Patented Nov. 13, 1923. IAWSBQKM "r sauce.

WILLIAM CHARLES DOWD, OF QUINCY, ILLIIITOISL cnurnrruear. rum.

' Application filed September 13, 1922. Serial No. 587,988.

To all whom it may conaem: The inlet communicates with an interior Be it known that I, 'Wmm'AM CHARLES chamber 5, which communicates in turn with Down, a citizen of the United States, and the vanes of an impeller 7. The latter is a resident of Quincy, in the odunty bf of the usual type, being curved as shown Adams and State of Illinois, have invented in Figure '2 to provide curved passages 8 a new and useful Improvement in Centrifwhich enlarge as they near the outer edge ugal Pumps, of which the following is a of the impeller. As will be seen from F igfull' clear, and exact description. ure 1', the passages 8 lead from each side of. My invention relates to centrifugal the casin to a common passage 9 at thepumps, and it consists in the combinations, center. rdinarily, the water which is. constructions and arrangements herein deforced through the passages 8 and 9 bescribed and claimed. tween the vanes is thrown into an outer One difficulty in the use of centrifugal annular chamber 10 which leads to the dispumps lies in the fact that a centrifugal charge pipe 4. pump is ordinarily built for large capaci- In the present instance, however, I proties and requires large capacities to operate vide a' ring such as that best shown in efliciently. Withthe ordinary pump, asthe Figures 2 and 3. This ring has a body head decreases, the horse power required to portion 11 which is shrunk onto the rim drive the pump increases, due to the fact of the impeller. The body portion of thea given time i. e., is operating under greater 4 the openings between the vanes 6, the wall capacity. Many. times it is highly desirable of the recesses being curved as shown in stantially the same horse power under varyentrance of the water into the annular ing heads. chamber 10. It will be noted that one wall so The main object of this invention is to of the outlet or opening 13forms a substanprovide a centrifugal pump having a comtial continuation of one wall 'of,the vane ;6. paratively flat characteristic, orone which From the foregoing description of the requires substantially the same amount of construction of the device, the operation power to drive it at varying heads. thereof may be readily understood. In the A further object of my invention is to ordinary centrifugal pump the ring 11 is provide a simple means for changing the omitted, and the water has-free movement ordinary centrifugal pump into one having into the chamber 10. I have found that b u flat or nearly constant horse power charproviding the ring 11 and curving the wal s acteristic, for any delivery of capacity and thereof in the manner shown, the water, head. which would ordinarily be thrown out from in the following specification, and the novel small openings 13, the result being that the features of the invention will be particuflow of water is throttled and is ejected into lagly pointed out in the appended claim. the chamber 10 at a very highfspeed, which as y invention is illustrated in the accomdoes not vary materially with considerable pan mg drawings, forming part of this variation inthe head. With a pump of this ap ication, in which kind, it is possible to ump the water. or

igure 1 is a central longitudinal section other liquids with a suhstantially constant through a portion of thedevice, application of power. Electrlc motors 10o Figure- 2 is atransverse central section which are used to drive pumps constructed through the impeller. according to the present invention there- Figure 3 is a section of a ring, fore are not liable, to be overloaded, as is Figures is an end view of the device, and the case with pumps in whichthe horse Figure 5 is a side elevation, a portion power characteristic rises speedily as the its being shown in section. head varies.

Referring now to Fi res 4 and 5, I have, I claim: I I shown therein a centrii -li 1 pump compris- A centrifugal pump comprising a casing mg a base 1, upon which is mounted a having an inlet'and'an outlet, an impeller casing 2 having an inlet 3 and an outlet e. having curved vanes spaced apart to prono n I mam vide curved nuid passages enlarging toward .vanes, and being provided with an openthe outer rim of the impeller, and means mg contiguous to one wall of the ad 10 carried by the impeller for throttling the jacent vane, the wall of said recess being fluid delivered from said curved passages, curved from the edge of the wall of a vane said means comprising a ring secured to the in advance to the opening in the succeeding rim of the impeller, said ring having vane, whereby the fluid is directed toward a recess registering with the end of the openin the curved passage between spaced apart WTLLIAM CHARLES DOWD. 

